646 BULLETIN 100, UNITED STATES NATIONAL MUSEUM. 



Family EURYLEPTIDAE. 



Genus PROSTHECERAEUS Schmarda. 



9. PROSTHECERAEUS PAPILIO (Kelaart). 



Plate 2, fig. 9. 



Planaria papilionis Kelaart, 1858, Journ. Ceylon Branch Rov. Asiat. Soc, 



1856-1858, p. 136. 

 Acanthozoon papilio Collinwood, 1S76, Trans. Linn. Soc, ser. 2. Zool.. vol. 



1, p. 95. 

 Pseudocerost papilio Lang, 1884, Naples Monogr., p. 546. 



A single specimen, which may be identical with Kelaart's Planaria 

 papilionis from Ceylon, was collected in Subic Bay, Luzon, in Jan- 

 uary. Unfortunately no specimen was brought under my direct ex- 

 amination. The following description is based upon Professor 

 Bartsch's careful note and colored drawing. 



The body in life was oval in shape and had a frilled margin. The 

 tentacles appeared as two short, obtusely pointed outgrowths of the 

 anterior margin of the body. In the resting state the worm measured 

 22 mm. long by 15 mm. broad; when fully extended it may have 

 reached 35 mm. in length. 



The dorsal surface was of an ashy-gray color, merging to deep 

 purplish brown on either side, and was mottled more or less uni- 

 formly all over with minute dark-brown spots. The extreme margin 

 was marked by a narrow colorless stripe, as is seen in Collingwood's 

 figure. A longitudinal band of an ashy-gray color with a touch of 

 purple extended almost throughout the median line. 



The present example shows a slight difference in its general 

 coloration from Kelaart's form, which is of a yellow color. It may. 

 however, be advisable to regard this as a variation. After some hesi- 

 tation I have referred this specimen to Planaria papilionis and ar- 

 ranged it under the genus Prostheceraeus on account of a close re- 

 semblance of their markings and short, obtusely pointed tentacles. 



This specimen seems to be closely allied to Laidlaw's Pseudoceros 

 collingwoodi from Pulau Bidan, near Penang, in which the dorsal 

 surface is of mottled dark-brown or brownish-white color and is 

 bordered by a thin white marginal stripe. One of the distinctive 

 characters is the presence of an equally fine black submarginal line 

 just inside the marginal. 



10. PROSTHECERAEUS MELEAGRINUS (Kelaart). 



Plate 2, fig. 10 ; text fig. 5. 



Planaria meleagrina Kelaabt. 1858. Journ. Ceylon Branch Roy. Asiat. Soc. 



1856-1858, p. 137.— Lang, 1884, Naples Monogr., p. 613. 

 Stylochoplana meleagrina Con r no-wood, 1S70, Trans. Linn. Soc. ser. 2, 



Zool., vol. 1, p. 98. 



In the collection there is a single individual, which seems to agree 

 with Collingwood's description and figures of Planaria meleagrina 

 Kelaart from Ceylon, so far as they go. It was collected in the Bay 



